US3773431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple shell turbine casing for high pressures and high temperatures
Assignee: BBC Brown Boveri AG Switzerland
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Filing: 1971-11-18
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Granted: 1973-11-20
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Expires: 1991-11-18
Abstract
Abstract A multiple shell casing for a turbine operating at high pressures and temperatures includes a multi-stage inner casing in the form of a guide blade carrier which is divided along an axial plane, and an outer casing also divided along that same plane. The outer casing is fabricated from sheet metal parts welded together, the inner casing is supported by a pair of axially spaced load-bearing rings which surround it, and these rings which extend through, and also support, the outer casing are anchored onto the turbine foundation.
Inventors
- 👤 H Bellati
- 👤 W Domer
- 👤 H Huber
- 👤 W Rutti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:48
CPC Classifications
F; F01; F01D; F01D25/00; F01D25/24; F01D25/26; F01D25/28
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
175 words
A multiple shell casing structure for turbines operable at high pressures and high temperatures which comprises an outer casing constructed in the form of two all-welded longitudinal upper and lower halves joined together along an axially dividing horizontal plane, each said casing half being comprised of a rectangular frame, axially spaced radially extending semicircular load bearing ring halves secured to said frame, and a semi-cylindrical jacket half of plate material secured to said ring halves and frame, and an inner casing constituting a guide blade carrier surrounding the turbine rotor, said inner casing being likewise constructed in the form of upper and lower longitudinal halves joined together along the same plane which divides the upper and lower halves of said outer casing, the upper and lower halves of said inner casing being supported by and within said load bearing rings and the load bearing ring halves correlated to the lower half of said outer casing being seatable on a foundation provided for the turbine so as to carry the entire load of the casing structure.
Claim 2
Dependent Claim
175 words
A multiple shell casing structure for turbines operable at high pressures and high temperatures which comprises an outer casing constructed in the form of two all-welded longitudinal upper and lower halves joined together along an axially dividing horizontal plane, each said casing half being comprised of a rectangular frame, axially spaced radially extending semicircular load bearing ring halves secured to said frame, and a semi-cylindrical jacket half of plate material secured to said ring halves and frame, and an inner casing constituting a guide blade carrier surrounding the turbine rotor, said inner casing being likewise constructed in the form of upper and lower longitudinal halves joined together along the same plane which divides the upper and lower halves of said outer casing, the upper and lower halves of said inner casing being supported by and within said load bearing rings and the load bearing ring halves correlated to the lower half of said outer casing being seatable on a foundation provided for the turbine so as to carry the entire load of the casing structure.
Claim 3
Dependent Claim
38 words
A multiple shell casing structure for turbines as defined in claim 1 wherein said outer casing is provided with at least one thermally variable lead-through for a steam inlet pipe which is rigidly connected to said inner casing.
Claim 4
Dependent Claim
40 words
A multiple shell casing structure for turbines as defined in claim 1 and which further includes brace type supports located within said outer casing and which extend between said load bearing rings and the end plates of said semi-cylindrical jackets.
Claim 5
Dependent Claim
67 words
A multiple shell casing structure for turbines as defined in claim 1 wherein each said semi-cylindrical jacket half includes a semi-cylindrical bleed chamber mantle located between and secured to said axially spaced semi-circular load bearing ring halves, and semi-cylindrical exhaust steam mantles located between and secured to each of said bearing ring halves and to semi-circular end plates forming the corresponding end walls of said jacket half.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |